Drawing sight



H. G. PERRY4 DRAWING SIGHT Nov. 1s, l1941.

Filed Nov. 14, 1940 INVENTOR.

HENRYGPE Y. @Q7 ATTORNEE.

Patented Nov. 18, 1941 UNITED STATES 2,263,101v j e 'Ilhis'inventon relates to'drawing sights and more particularly to an improvement in sketching devices to facilitate the reproduction of scenes,

i although it may be employed with equal advantage for otherl purposes.`

It contemplates more especially the provision of an improved drawing sight that is adjustably supported having movable intersecting lines of vision to serve as an aid in preparing `reproductions inproportional size in three dimensions with increased speed, accuracy and improved proportions. L

One object of the present invention is to simplify the construction and improve the operation of devices ofthe character mentioned. l5

Another object is to provide a drawing sight that is adjustablysupported for movement along intersecting planes to afford faster and greater variations in lines of vision sothat objects can be reproduced from different view points and at varying angles. f. 1

p Stillanother object is to provide a drawing p sight having a plurality of movable wires that can be adjustably positioned to define different lines of vision within the limits of the sight area in- I volved.

I A further object is to provide a drawing sight having a view finder area that receives a view sheet detachably supported therein for ready substitution. f ,30

A` still further object is to provide a plurality of View sheets having permanent squares `inscribed therein to extend over-the sight area for selected support in the view nder frame.

Still a further object is to provide a drawin sight having replaceable view sheetsI with different size squares inscribed therein in cooperation with slidably mounted lines of vision.

An additional object is to provide a drawing sight that is adjustably mounted in intersecting 4Q planes together withV a plurality `of replaceable View sheets having different size squares. inscribed therein for cooperation with slidably lmounted lines of vision.

Other objects and advantages will appearfrom the following description of an `illustrative embodiment `of the present invention.

In the drawing: Figure 1 is a perspective view of a drawing sight embodying features of the present invention.

. `Figure 4 is a sectional view of a standard sup- I port taken substantiallyalong line IV-IV of Figure 1.

Figure 5 is a quarter-sectional perspective View of adjustable wire anchoring mounts shown in operative, association with the wires defining lines of vision in Figure 1. i

Figure is a sectional view of a slidable wire anchoring mount `taken substantially along line VI--VIof Figure 1.

, Figure 7 is a' sectionalview of a slidablegwire anchoring mounty taken substantially along line `VIL-VII of Figure 1.

Figures is a perspective View of a transparent View sheet having squares permanently inscribed therein together with an edge mount for enabling the `manipulation thereof for placement and removal in the drawing sight shown in Figure 1.

Figure 9 is a sectional plan view taken substantially along line IX--IX of Figure 1.

The structure selected for illustration comprises a base plate II) ofI any suitable shape and construction to Vserve as a support for a` tubular standardgII that telescopically receives a stud I2 (Figure 4) through `the lower end thereof. The stud` I2 has a threaded shoulder I3 immediately v p above its tapered head I4 that serves as a complement of a correspondingly tapered seat I5 mergingwith an aperture I6 that extends through the basegplate I 0. VA suitable collar I'I threadedly engages the stud shoulder I3 to rigidly mount the stud I2 to thebaseplate lil. The collar yI'I is preferably provided with a plurality of uniformly spaced radial lines IB thatdene angular positions relative to an arrow marker I9 inscribed vertically along the lower portion of the tubular standard II to cooperate with the radial lines I8 in determining the angular position of the standard III relative to its base I0.

`An annular groove 20 is providedin the upstanding stud I2 proximate to the upper extremityf2| thereof to receive the reduced extremity 22 of a threaded 4shank23 which has an enlarged knurled head 24` provided thereon to enable the radial' manipulation of the threaded shank 23 thatengages a correspondinglythreaded aperture 25 providedv through the wall of the tubular standard II. With this arrangement, the tubularstandard I`I may be rotated to any desired angular position determined by the arrow marker I9 relative to the graduated lines I8 and held against rotation in any selected position by turning down, the lnurle'd head 24 so that the extremity-2v2 of `thevth'eaded shank 23 will tightly enly offset arm 26 to cooperate with the radial lines 32 in determining the angular position of the bracket 30 relative to the horizontally offset arm 26. An annular groove 34 is provided in the stud 21 proximate to the extremity 35 thereof to re-` ceive the reduced extremity 36 of a threaded shank 31 which has an enlarged knurled head 38 provided thereon to enable the manipulation of the threaded shank 31 that engages' a correspondingly threaded aperture 39 provided through the wall of the horizontally offset arm 26 of the standard The bracket 30 is provided, in this instance, with a plurality of apertures 40 which receive threaded fasteners 4| therethrough that are anchored in the side wall 42 of the drawing sight frame 43. The drawing sight frame 43 has a vertical wall 44 parallel to the wall 42 and oppositely disposed parallel walls 45-46 that are joined to each other to define a rectangular frame. The open frame 43 serves asa sight through which objects may be observed for sketched reproduction on a separate sheet as will appear more fully hereinafter. As shown, the parallel walls 42-45 and 45-46 of the sight frame 43 are of substantial depth to provide a viewing chamber therethrough,

In order to divide the viewing chamber in the frame 43 into a plurality of uniform squares, a transparent view sheet 41 is provided with intersecting opaque lines 48--49 that dene uniform squares 50 therein. The view sheet 41 is, in this instance, attached to a rigid bar that has a longitudinally extending groove 52 yto receive one edge of the view sheet 41. Attachment is effected between the view sheet 41 and the top bar 5| by means of a plurality of suitable fasteners 53 which extend transversely through the side walls of the bar 5| and the longitudinal groove 52 therein to engage the View sheet 41, thereby effecting permanent attachment of the bar 5| toV one edge of the view sheet 41.

A handle 54 is attached to the view sheet bar 5| to enable the manipulation thereof for attachment and detachment to the opening deiined by the frame 43. In order to conveniently associate and remove the view sheet 41 relative to the framel 42, longitudinal grooves 55 are provided in the inside surfaces of the side walls 42-44 and bottom wall 46 near the rear edges 56 of the frame 43 (Figure 9) to serve as complements of the corresponding edges defining the outline of the view sheet 41. A slot 51 is provided through the top wall 45 of the frame 43 in alignment with the grooves 55 so that the View sheet 41 may be displaced therethrough for reception in the grooves 55 with the view sheet top bar 5| resting on the top surface of the frame Wall 45 (Figure 1).-

This enables any number of view sheets 41 to be substituted or replaced by other View sheets of the same external size with squares 50 of smaller or larger size inscribed therein depending `to be-reproduced, the wires 58-59-6l 8| in Figure 9.

upon the dictates of commercial practice. In order that lines of vision may be marked with reference to any points or views of an object or moved from one view to the next for successive reproduction in proportional size, intersecting wires 58 and 58 are tensioned across the frame 43 proximate to the forward edge 60 thereof. Another wire 6| is tensioned across the frame 43 for extension parallel to the vertical wire 58, the wire 6| serving to fix the position of the eye with respect to the wire 58 so that the sketcher may leave the line of vision and always come back to the same point or line of sight as will be explained more fully hereinafter.

So that the intersecting wires 58-59-6I may be held taut and the point of intersection varied to correspond with selected points on an object are mounted in confronting pairs of brackets (i2- 63. The brackets 62 consist of a square body 64 having an enlarged peripheral flange 65 thereon of corresponding shape to engage the outside surfaces adjacent longitudinal slots 66 and 61 provided near the forward edge 60 of the side walls 42-45 of the frame 43. The body 64 of the bracket 62 is sized to project within the slots 66-61 to freely slide therealong.

An axial extension 68 is provided on the bracket body 64 through which extends a threaded bore 69 to receive a correspondingly threaded stud 1i] having a diametrical head slot 1| therein to enable rotation responsive to the use of a screw driver. Wires 58--59-6l are anchored in the stud 10 so that they may be tensioned or loosened depending upon the degree of rotation of the threaded stud 18 relative to the threaded bore 69 in the brackets 62. The other extremity of the wires 58-59-6I project through openingsV 12 provided axially through the bracket 63 to communicate with a recess 13. The recess 13 receives a correspondingly shaped cap 14 Within which the wires 58-59-6I are anchored for displacement Within the recess 13 of the brackets 63 against the urge of a coil spring 15 serving as a resilient mount therefor.

It will be apparent, therefore, that the Wires 58-59-6I may be drawn tight against the urge of the spring 15 in that the body of the brackets 63 also has peripheral flanges 16 to engage the outer surfaces of the side and bottom walls 44-46 of the frame 43 owing to the provision of slots 18 and 19 therein. It Will be observed with this arrangement that the wires 58-59-6I may be drawn taut to retain the confronting pairs of brackets 62-63 in any adjusted position within the limits of the slots 66-61 and 18-19. This affords the displacement of the intersecting wires 58-59-6l so that the line of vision may be varied and the position of the eye with respect to the line of vision oriented relative to the second vertical wire 6| that may be projected by the eye on another portion of the object to be reproduced.

'Ihis is illustrated by the dotted lines 80 and For instance, the eye will be directed along a straight line 8l which aligns With the vertical wire 58 to determine two imaginary points 82 and 83 that are directly in line with the eye. Holding the eye in the same position and looking in the direction of the other wire 6|, two additional imaginary points 84 and 85 are determined. The appreciable depth of the viewing chamber defined by the frame 43 having its side walls of substantial depth, assists in accurately orienting the observers eye position from the viewing chamber within the frame 43. By remembering these two points iid-85, the latter being lpreferably oriented with respect to the squares 5i! and the object that is to be sketched, the sketcher may always go back to the same position along the line of vision. This position may be changed from timev to time by slidably displacing the intersecting wires 58-59 so that the point of their intersection corresponds with various points selected upon the object.

Then, too, perspectives can be proportionally reproduced by turning the frame 43 relative to its axially supporting arm 26 and this position will be indicated by the calibrated radial lines 32 relative to its marker 33. Other angles or viewpointsfrom which the object is to be sketched may be selected by changing the position of the frame 43 with respect to the vertical standard Il, and this position will be determined by the graduated lines I8 relative to the arrow marker I9. Consequently, the position of the frame with respect to the eye can always be varied and retaken as occasion may require.

In reproducing a picture, landscape, or other object, it may be viewed through the view sheet 41. The sketcher has a correspondingly lined guide sheet available on his desk or sketching board with proportionally sized squares therein.

The transparent or translucent sketching sheet is preferably placed over the-correspondingly lined guide sheet so that the original painting, landscape or other object is seen through the View sheet 4T according to the respective squares therein. translucent paper in accordance With similar squares seen therethrough from the guide sheet.

In this manner, the entire object that is being viewed may be conveniently, accurately and rapidly reproduced on the sheet that is placed over the correspondingly lined guide sheet so that proportional reproduction can be completed without entailing any appreciable time, variation, proportions and inaccuracies. Then, too, perspectives as well as reproductions from different VieW points may be rapidly effected. Even though the `reproduction is not completed at one sitting, the adjustments and other graduated indicators permit the resetting of the frame 43 to correspond With the original setting. For that matter during the reproduction, the frame 43 can be changed from one position to another and then returned to the initial position to facilitate intermediate observations that may be found desirable.

Various changes may be made in the embodiment of the invention herein specically described Without departing from or sacricing any of the advantages of the invention or any features thereof, and nothing herein shall be con- It is sketched on the transparent or- CII strued as limitations upon the invention, its concept or structural embodiment as to the whole or any part thereof except as defined in the appended claims.

I claim: l. A drawing sight comprising a frame, a transparent View sheet mounted in said frame, said view sheet having opaque intersecting lines inscribed therein tov define uniform squares, means-for adjustably supporting said frame in a variety of angular positions, Wire mounting normal planes, and a plurality of parallel intersecting sight Wires anchored in said mounting brackets and .tensioned across said frame in spaced parallel relation to said View sheet.

3. Afdrawing sight comprising a rigid frame having an open sight or view chamber, intersecting lines extending across the sight area of said frame to define uniform squares in a common plane, and intersecting sight wires extending across said frame in a spaced parallel plane relative to said intersecting sight area lines to provide a viewing chamber of appreciable depth.

4. A drawing sight comprising a frame having an open sight or View chamber, said view chamber having intersecting lines extending therein to dene uniform squares, and a pair of parallel Wires intersecting another single sight Wire tensioned across said frame in spaced parallel relation to said first named intersecting lines to enable orienting the observers eye to a definite position relative to the viewed objects.

5. A drawing sight comprising a frame, a transparent View sheet mounted in said frame, said View sheet having opaque intersecting lines inscribed therein to define uniform squares, means for adjustably supporting saidframe in a variety of angular positions, Wire mounting b-rackets slidably mounted along said frame, and a pair of parallel wires intersecting another wire, said last named parallel and intersecting Wires being anchored in said mounting brackets and tensioned across said frame in spaced parallel relation to said View sheet to constitute sight orienting Wires relative to the intersecting lines on said View sheet,

HENRY G. PERRY. 

